Perftest

• ib_read_bw(1) RDMA read bandwidth test
• ib_read_lat(1) RDMA write latency test
• ib_send_bw(1) RDMA send bandwidth test
• ib_send_lat(1) RDMA send latency test
• ib_write_bw(1) RDMA write bandwidth test
• ib_write_lat(1) RDMA write latency test